OCR Text |
Show o ,......100 /90ppm o 3 50~~~~~~--~~~ 600 700 800 900 1000 Temp. (·e) ~"ig. 16 [NOx] in Exhaust Gas of Regenerative Burner without Denitration (3) Lowering the denitration reaction temperature by adding COG In order to lower the denitration reaction temperature, we added a very small amount of COG - an easily available and inexpensive reducing gas. Fig. 18 shows the result. By adding 3600 ppm (= 0.360/0) of COG, the concentration of NOx was reduced to 90 ppm or less (at 11 % 02) in the temperature ranging from 700 to 950°C. -9- 100 A'r fuel ratio 1.1 Cycling lime 1'3 &l- eo l ,. ec c 60 .2 ~ 40 0 ~ 20 / >< 0 "'0 0/ z0 ~o--o/ c .2- 200 - E ~o~ ~Q, :: Q, c- -.8.. 100 0\ ~ '0 '";' , ~ 0 700 eoo 900 000 Temp. (-Cl Fig. 17 Characteristics of Denitration In Regenerative Burner 100 &l- ~!:! eo c 60 .2 ~ 40 ¥ 20 >< 0 0 z -20 c -BE 200 ~Q, :: Q, c- ~ A'r fuel ratio I I ~IC",ung ""'" 1;3~l ~ f- 1~~ /v . ..4 , ... . 0 /~ !. ~-o--o--o;~- o' o-.....c;y/ 0 S~Ymbol I~N()c) -0-- 1.0 0-- -- - --- - -A --- -- --- 1.0 r:-0~_ -0-.. - .. - 1.0 ...... ,..0--0 . R'....... o~ -.o. ___ ~-_!:- .. ~-:~. _ q o 700 eoo 900 000 Temp. ("Cl Added COG - 3600pelm 900~ 3600ppm Fig. 18 EITects of Added COG on Denitration in Generative Burner |